Cos2a = 2cos^2a-1 for all values of a

true or false?

A rhombus is a square always sometimes never

Some parts of California are particularly earthquake-prone. Suppose that in one metropolitan area, 31% of all homeowners are insured against earthquake damage. Four homeowners are to be selected at random.

Which expression has a value that is equivalent to 5n + 13 when n = - 5? A) 2n + 2 B) N² + 13 C) 4n + 8 D) n + 8

Imagine that a lake contains two kinds of fish: trout and bass. 60% of the fish in the lake are bass and 40% are trout. If you caught 5 fish at random from this pond, which of the following would you expect to catch? a. 0 bass and 5 trout b.

Use the linear combination method to solve this system of equations. What is the value of x? 3x+7y=31 and - 3x-2y=-1

What is the 7 described as in 2 x 5 + 7 (3 + 13) ?

Write an expression that is equivalent to 4 (x+2y)

For an employee training, the employee to instructor ratio is 18 to 2. If there are 20 instructors for the training, how many employees participated in the training?

Marisa drank one cup of milk and ate x small vanilla cookies for a snack. The linear equation below represents y, the total number of calories in Marisa's snack. y = 12x + 120 a. what is the y-intercept represented by this equation? b.

Savannah had 40 iris blooms last year this year she had 15% more iris blooms how many more hours blooms did Savannah have this year